Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..875r&link_type=abstract
Astronomy and Astrophysics 285, 875-879
Astronomy and Astrophysics
Astrophysics
21
Scientific paper
During the last decade, a debate has arisen whether the grouping of stars called NGC 2451 is a real star cluster. We investigate the corresponding area of the sky kinematically, using proper motions of the PPM catalogue. The group of stars that was originally called NGC 2451 shows a large scatter of their proper motions, which proves that they do not form a cluster. However, close-by we find a group of 24 PPM stars with common proper motion. A colour-magnitude diagram of 19 of these shows an extremely well-defined main sequence, giving a distance of about 220 pc. This cluster is not NGC 2451. We tentatively call it Puppis Moving Group (PMG). There is strong indication for a second cluster at about 400 pc. Photometry, radial velocities and proper motions of stars fainter than the magnitude limit of PPM are needed to further investigate the matter.
Bastian Ulrich
Röser Siegfried
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